Downton Abbey fans in the U.S. may have to wait until January 5th for new episodes to air on PBS, but the release of the trailer for Season Four offers a hint of what's to come. Mary is still grieving over the death of Cousin Matthew, of course, but the rest of the family seems to be coming back to life again, with the arrival of new characters (including jazz singer Jack Ross, played by Gary Carr), what looks to be an increasingly central role for Lady Rose, and plenty of tea-drinking. The Joy Formidable's "Wolf's Law" on the soundtrack drives home an optimistic tone for the new season.